Stop clamp



April 1936. H. P. PHILLIPS 2,038,235

STOP CLAMP Filed Nov. 9, 1955 INVENTOR.

mama 1? Phillips ATTORNEYS Patented Apr. 21, 1936 PATENT OFFICE 2,038,235 s'ror' CLAMP Harold P. Phillips, Hastings, Mich., assig'nor to Hastings Manufacturing Company, Hastings,

Mich.

Application November 9, 1935, Serial No. 49,015

11 Claims.

The main objects of my invention are:

First, to provide a stop for use in connection with a milling operation on a piston wherein the sides of a slot in the skirt of a piston are beveled to provide seats for a piston expander.

Second, to provide a device of the nature described which is simple in construction so that the production cost thereof is small and which may be readily and quickly applied to a piston.

Third, to provide a stop adapted to be clamped to a piston, which will furnish a firm support by means of which the piston may be positioned with respect to the mandrel of a milling cutter to eliminate chattering or a tendency of the piston to be kicked away from the milling cutter, likewise to eliminate danger to the operator resulting from such tendencies and to prevent injury to the piston.

Objects relating to details and economies of my invention will appear from the description to follow. The invention is defined and pointed out in the claims.

Preferred embodiments of my invention are illustrated in the accompanying drawing, in which:

Fig. 1 is a perspective view of the device of mylnvention in operative position on a piston, illustrating the mode in which the piston is positioned against a milling cutter.

Fig. 2 is a fragmentary sectional view taken along the line 22 of Fig. 3, illustrating the manner of alining and clamping my device, a succeeding position of the cutter being illustrated in dotted lines.

Fig. .3 is a fragmentary sectional view taken along the line 3-3 of Fig. 2.

Fig.. 4 is a fragmentary top plan view illustrating my device in operative position, the milling cutter having been removed.

Fig. 5 is a fragmentary view of the piston in transverse section illustrating the final position of a piston expander with respect thereto.

Fig. 6 is a perspective view of a modification of my invention, the position of a piston, clamped by the device of this modification being indicated by dotted lines.

In the drawing, reference numeral I indicates a conventional piston having a slot 2 in the skirt 3 thereof. The use of piston expanders in connection with such pistons when they or the cylinder walls have become worn is well known.

Such a piston expander is indicated by the reference numeral 4 in Fig. 5 and comprises a resilient section of spring metal bent in the direction of" its length as shown in that figure and is about seven-eighths of an inch in width. It is customary to provide beveled edges 5 on slot 2 to furnish seating surfaces for the expander. This operation is preferably performed by a V-sh'aped milling or beveling cutter 6 which may be suitably fastened on the mandrel or arbor 1 of an electric drill indicated by the reference numeral 8.

It has been found that when such an operation is attempted without the use of stop or guiding means of one kind or another the piston upon being presented to the cutter is kicked away therefrom by the rotating cutter with the result that it is very difiicult to obtain a satisfactory beveling cut. This kicking or chattering effect is, further, dangerous to the operator inasmuch as the piston is manually held to the action of the cutter. Further, the cutter cannot run out to the end of the slot and thereby injure the piston.

To eliminate the above mentioned objections, I provide a stop clamp 9 consisting of a block II) which is bored at H to receive a headed screw l2. The screw is formed with a flattened portion or web l3 adjacent the head I4 thereof and a wing nut I5 engages screw l2 whereby block I0 is rigidly clamped to skirt 3. The flattened portion 13 is received in slot 2 of the piston whereby the block may be accurately positioned. On the inner side thereof, block I0 is provided with a V notch I6 which in operative position is in alinement with slot 2 and bore l I.

In operation, the milling cutter is entered in slot 2 with the cutter extending into notch. I6

andthe mandrel 'l abutting the face of block I0 adjacent the notch. Piston I is advanced against the cutter until the skirt contacts mandrel 'l of the cutter as illustrated in Fig. 2, whereupon the piston is moved longitudinally with respect tothe cutter, or to the left as viewed in Figs. 1 and 2. This cutting operation is continued until the slot 5 is beveled for a; length corresponding to the width of the piston expander 4 or approximately seven-eighths of an inch, as illustrated in Fig. 4, with the result that proper seats 5' are formed in slot- 2 for the end of the expander. In the embodiment illustrated in Fig. 6, I provide a clamping member in the form'of a ring I! having a tang l8 depending radially and inwardly from the upper side thereof. As will be apparent, the tang cooperates with slot 2 to position member I1. Adjacent and in line with tang I8, I provide a notch l6 in the side of clamping member I! for the purpose which has been described, and at the side of clamping memher I! which is opposite the tang and notch,

I drill and tap member I! to receive a clamp screw IS. The manner of employing the device illustrated in Fig. 6 will be obvious. Clamp screw l9 engages skirt 3 of the piston at the side thereof opposite slot 2 to firmly secure member I! to the piston with the notch l6 alined with re-' spect to slot 2 by means of tang l8.

By the above described embodiments of my invention, I provide a stop and positioning clamp which enables the firm positioning of a beveling milling cutter with respect to a slot in a piston to be beveled. Tendency or the piston to be kicked away by the cutter and for the cutter to run out to the end of the slot is eliminated inasmuch as a firm positioning pressure may be exerted by block ill or member I! against the mandrel I of a cutter to guide and support the piston during the radial cutting action of the cutter. The possibility of personal injury to an operator is greatly reduced accordingly, and the beveling operation is facilitated and expedited and injury to the piston prevented.

In the event that the skirt of the piston is thin, the milling cutter, being tapered or wedgeshaped, will obviously produce a wider slot or channel, the crosswise dimension of the slot being greater both on the inner and-outer sides of the piston. This increase in dimension will equalize the efiect produced by the piston expander l, inasmuch as were the same expander used in a thin piston skirt as in a thicker one, the width of the channel being the same in both cases, the slnrt would be excessively sprung outwardly by the expander. This tendency, as before stated, is automatically counteracted by the increased width of the slot or channel formed in a thin piston skirt, since the expanding action of expander 4 is decreased in proportion to the width of the slot in which it seats.

I have illustrated and described my improvements in embodiments which I consider very practical. I have not attempted to illustrate or describe other embodiments or adaptations as it is believed this disclosure will enable those skilled in the art to embody or adapt my improvements as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A -stop for use with a V-shaped milling cutter, comprising a block having a bore therein, a headed screw receivedin said bore and having a flattened portion adjacent the head thereof adapted to be received in a slot in a piston, and

a wing nut coacting with said screw to clampsaid block in operative position on said piston, said block having a V notch adapted to be alined with said bore and slot whereby the mandrel of said cutter may abut against said block to position said cutter, said V notch furnishing clearance for said cutter.

2. A stop for use with a V-shaped milling cutter, comprising a block, a headed screw received in said block and having a flattened portion adiacent the head thereof adapted to be received in a slot in a piston, and a wing nut coacting with said screw to clamp said block means coacting with said positioning means to clamp said block in operative position on said piston, said block having a V notch adapted to be alined with said slot whereby the mandrel of said cutter may abut against said block to position said cutter, said V notch furnishing clearance for said cutter.

4. A stop for use with a V-shaped milling cutter, comprising a block, positioning means adapted to be received in a slot in a piston, and means to clamp said block in operative position on said piston, said block having a V notch adapted to be alined with said slot whereby the mandrel of said cutter may abut against said block to position said cutter, said V notch furnishing clearance for said cutter.

5. A stop for use with a beveling cutter, comprising a body member adapted to be rigidly clamped to a piston, means coacting with a slot in said piston to position said member thereon, and means to clamp said member on said piston, said member having a V notch in line with said positioning means whereby the mandrel of said cutter may abut against said member, the V notch furnishing clearance for the cutter.

6. A stop for use with a beveling cutter, comprising a body member adapted to be rigidly clamped to a piston, means to position said member on a piston, and means to clamp said member on said piston, said member having a V notch in line with said positioning means whereby the mandrel of said cutter may abut against said member, the V notch furnishing clearance for the cutter. I

7. A stop for use with a beveling cutter, comprising a body member adapted to be rigidly clamped to a piston, means to position said member on a piston, and means to clamp said member on said piston, said member having a V notch in line with a slot in said piston whereby the mandrel of said cutter may abut against said member, the V notch furnishing clearance for the cutter.

8. A stop clamp for a beveling cutter, comprising a circular member adapted to encircle a piston, a tang disposed radially and inwardly on said member to be received in a slot in said piston, said member having a threaded hole opposite said tang, and a clamp screw coacting with said hole to clamp said member to said piston, said member having a V notch in the side thereof and adjacent and in line with said tang and said slot whereby a beveling cutter may be positioned with the mandrel thereof abutting said member and the cutting edge received in said notch.

9. A stop clamp for a beveling cutter, comprising a member adapted to encircle a piston, a tang disposed on said member to be received in a slot in said piston, said member having a threaded hole opposite said tang, and a clamp screw coactingwith said hole to clamp said member to said piston, said member having a V notch in the side thereof and adiacent and in line with said tang and said slot whereby a beveling cutter may be positioned with the mandrel thereof abutting said member and the cutting edge received in said notch.

10. A stop clamp for a beveling cutter, comprising amember adapted to encircle a piston, a tang disposed on said-member to be received in a slot in said piston, and means opposite said tang to clamp-said member to said piston, said member having a V notch in the side thereof and adjacent and in line with said tang and said slot whereby a beveling cutter may be positioned with the mandrel thereof abutting said member and the cutting edge received in said notch.

11. A stop clamp for a beveling cutter, comprising a member adapted to encircle a piston, means disposed on said member to position the same on a piston, and means opposite said posi tioning means to clamp said member to said piston, said member having a V notch in the side thereof and adjacent and in line with said positioning means whereby a beveling cutter may be positioned with the mandrel thereof abutting said member and. the cutting edge received in 5 said notch.

HAROLD P. PHILLIPS. 

